Server is lagging when raining/snowing after big snow remove in McEdit.

For a short time ago, i had removed all snow on my world map, and when it is raining/snowing on my server now, it is lagging a bit. I think it is because the snow have to be generated again in all the snow biomes.
Are there a program that can regenerate the original layers on the world without regenerating all the chunks?
Can someone help me solve this problem?

 

There are no programs that can regenerate the original layers on the world.
The only thing you can do is to let your server run while you don't need it so it can regenerate all the snow again.

 

Alternatively, if you removed the snow for a reason, just turn off weather altogether. Multiverse has options for doing that in worlds.yml, or just use a plugin like this.